| /* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */ |
| /* cairo - a vector graphics library with display and print output |
| * |
| * Copyright © 2006 Adrian Johnson |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it either under the terms of the GNU Lesser General Public |
| * License version 2.1 as published by the Free Software Foundation |
| * (the "LGPL") or, at your option, under the terms of the Mozilla |
| * Public License Version 1.1 (the "MPL"). If you do not alter this |
| * notice, a recipient may use your version of this file under either |
| * the MPL or the LGPL. |
| * |
| * You should have received a copy of the LGPL along with this library |
| * in the file COPYING-LGPL-2.1; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA |
| * You should have received a copy of the MPL along with this library |
| * in the file COPYING-MPL-1.1 |
| * |
| * The contents of this file are subject to the Mozilla Public License |
| * Version 1.1 (the "License"); you may not use this file except in |
| * compliance with the License. You may obtain a copy of the License at |
| * http://www.mozilla.org/MPL/ |
| * |
| * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY |
| * OF ANY KIND, either express or implied. See the LGPL or the MPL for |
| * the specific language governing rights and limitations. |
| * |
| * The Original Code is the cairo graphics library. |
| * |
| * The Initial Developer of the Original Code is Adrian Johnson. |
| * |
| * Author(s): |
| * Adrian Johnson <ajohnson@redneon.com> |
| */ |
| |
| #include "cairoint.h" |
| #include "cairo-error-private.h" |
| #include "cairo-output-stream-private.h" |
| #include <zlib.h> |
| |
| #define BUFFER_SIZE 16384 |
| |
| typedef struct _cairo_deflate_stream { |
| cairo_output_stream_t base; |
| cairo_output_stream_t *output; |
| z_stream zlib_stream; |
| unsigned char input_buf[BUFFER_SIZE]; |
| unsigned char output_buf[BUFFER_SIZE]; |
| } cairo_deflate_stream_t; |
| |
| static void |
| cairo_deflate_stream_deflate (cairo_deflate_stream_t *stream, cairo_bool_t flush) |
| { |
| int ret; |
| cairo_bool_t finished; |
| |
| do { |
| ret = deflate (&stream->zlib_stream, flush ? Z_FINISH : Z_NO_FLUSH); |
| if (flush || stream->zlib_stream.avail_out == 0) |
| { |
| _cairo_output_stream_write (stream->output, |
| stream->output_buf, |
| BUFFER_SIZE - stream->zlib_stream.avail_out); |
| stream->zlib_stream.next_out = stream->output_buf; |
| stream->zlib_stream.avail_out = BUFFER_SIZE; |
| } |
| |
| finished = TRUE; |
| if (stream->zlib_stream.avail_in != 0) |
| finished = FALSE; |
| if (flush && ret != Z_STREAM_END) |
| finished = FALSE; |
| |
| } while (!finished); |
| |
| stream->zlib_stream.next_in = stream->input_buf; |
| } |
| |
| static cairo_status_t |
| _cairo_deflate_stream_write (cairo_output_stream_t *base, |
| const unsigned char *data, |
| unsigned int length) |
| { |
| cairo_deflate_stream_t *stream = (cairo_deflate_stream_t *) base; |
| unsigned int count; |
| const unsigned char *p = data; |
| |
| while (length) { |
| count = length; |
| if (count > BUFFER_SIZE - stream->zlib_stream.avail_in) |
| count = BUFFER_SIZE - stream->zlib_stream.avail_in; |
| memcpy (stream->input_buf + stream->zlib_stream.avail_in, p, count); |
| p += count; |
| stream->zlib_stream.avail_in += count; |
| length -= count; |
| |
| if (stream->zlib_stream.avail_in == BUFFER_SIZE) |
| cairo_deflate_stream_deflate (stream, FALSE); |
| } |
| |
| return _cairo_output_stream_get_status (stream->output); |
| } |
| |
| static cairo_status_t |
| _cairo_deflate_stream_close (cairo_output_stream_t *base) |
| { |
| cairo_deflate_stream_t *stream = (cairo_deflate_stream_t *) base; |
| |
| cairo_deflate_stream_deflate (stream, TRUE); |
| deflateEnd (&stream->zlib_stream); |
| |
| return _cairo_output_stream_get_status (stream->output); |
| } |
| |
| cairo_output_stream_t * |
| _cairo_deflate_stream_create (cairo_output_stream_t *output) |
| { |
| cairo_deflate_stream_t *stream; |
| |
| if (output->status) |
| return _cairo_output_stream_create_in_error (output->status); |
| |
| stream = malloc (sizeof (cairo_deflate_stream_t)); |
| if (unlikely (stream == NULL)) { |
| _cairo_error_throw (CAIRO_STATUS_NO_MEMORY); |
| return (cairo_output_stream_t *) &_cairo_output_stream_nil; |
| } |
| |
| _cairo_output_stream_init (&stream->base, |
| _cairo_deflate_stream_write, |
| NULL, |
| _cairo_deflate_stream_close); |
| stream->output = output; |
| |
| stream->zlib_stream.zalloc = Z_NULL; |
| stream->zlib_stream.zfree = Z_NULL; |
| stream->zlib_stream.opaque = Z_NULL; |
| |
| if (deflateInit (&stream->zlib_stream, Z_DEFAULT_COMPRESSION) != Z_OK) { |
| free (stream); |
| return (cairo_output_stream_t *) &_cairo_output_stream_nil; |
| } |
| |
| stream->zlib_stream.next_in = stream->input_buf; |
| stream->zlib_stream.avail_in = 0; |
| stream->zlib_stream.next_out = stream->output_buf; |
| stream->zlib_stream.avail_out = BUFFER_SIZE; |
| |
| return &stream->base; |
| } |